About 5 percent of all UFO sightings cannot be easily explained by weather or human technology. A physicist argues that there's compelling evidence to justify serious scientific study and that the skeptics should step aside – for the sake of humanity.

Artist depiction of an asteroid on a collision course with Earth.
By Mopic/shutterstock.comJune 28, 2018

An asteroid on a collision course with Earth is inevitable. Astronomer Michael Lund explains how a new telescope under construction in Chile will become a vital tool for detecting objects that could devastate our planet.

Mission specialist Sally Ride became the first American woman to fly in space.
NASA's Goddard Space Flight Center June 18, 2018

35 years ago Sally Ride became the first American woman in space. But rather than focus on her own extraordinary achievements, her passion became boosting the number of girls pursuing STEM. Another pioneering astronaut remembers her friend and colleague.

The 35 m-diameter dish antenna of ESA’s deep-space tracking station at New Norcia, Western Australia.
europeanspaceagency/flickr June 12, 2018